drm/amd/display: drop duplicated .dsc_pg_control for dcn30

There're 2 .dsc_pg_control, drop the first one.
	.dsc_pg_control = NULL,
	.dsc_pg_control = dcn20_dsc_pg_control,
Signed-off-by: Flora Cui <flora.cui@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dcn30/dcn30_init.c

@@ -116,7 +116,6 @@ static const struct hwseq_private_funcs dcn30_private_funcs = {
 	.enable_power_gating_plane = dcn20_enable_power_gating_plane,
 	.dpp_pg_control = dcn20_dpp_pg_control,
 	.hubp_pg_control = dcn20_hubp_pg_control,
-	.dsc_pg_control = NULL,
 	.program_all_writeback_pipes_in_tree = dcn30_program_all_writeback_pipes_in_tree,
 	.update_odm = dcn20_update_odm,
 	.dsc_pg_control = dcn20_dsc_pg_control,